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Binary Pattern Finder

Upload any binary file and search for specific byte patterns using hex notation (FF D8 FF), text strings ("JFIF"), or regular expressions. The Binary Pattern Finder scans every byte in your file to find all occurrences of your pattern, showing you the exact offset, hex representation, ASCII interpretation, and surrounding context for each match. Supports wildcards in hex patterns (?? for any byte), adjustable context size, configurable max results, and case-sensitive or case-insensitive string search. All processing runs locally in your browser - no uploads, no signup, completely free.

Binary Pattern Finder

Upload any binary file and search for specific byte patterns using hex notation (FF D8 FF), text strings ("JFIF"), or regular expressions. See every occurrence with byte offset, surrounding context, and ASCII interpretation. Supports wildcards in hex patterns and byte-boundary regex matching - all processing runs locally in your browser.

Drop a binary file here or click to browse

Supports files up to 256 MB - searches byte-by-byte for your pattern

Features

Three Search Modes

Search using hex patterns (FF D8 FF with ?? wildcards), text strings (case-sensitive or not), or regular expressions against the file hex representation. Switch between modes and see results update instantly.

Hex & Wildcard Support

Enter hex bytes with space separators. Use ???? ??, **, or .. for wildcard bytes that match any value. Find patterns like FF D8 FF (JPEG header) or 50 4B ?? 04 (ZIP with wildcard version byte).

Context-Rich Results

Every match shows configurable surrounding context bytes in both hex and ASCII, the exact byte offset (hex and decimal), and the matched bytes. Easily scan results to understand the file structure around each match.

Large File Support

Reads files up to 256 MB for searching with chunked processing. Results are limited to 500 matches to keep the UI responsive, with a clear indicator when results are truncated.

Use Cases

Malware Analysis & Reverse Engineering

Search for known exploit patterns, shellcode signatures, or suspicious byte sequences in binary files. Find embedded executables, detect packer signatures, and identify known malware indicators.

File Format Investigation

Search for file structure markers - PNG IHDR/IEND chunks, JPEG segment markers (FF E1 for EXIF), ZIP local file headers (50 4B 03 04), or PDF objects (obj, endobj). Understand how a file is structured.

Data Recovery & Forensics

Locate embedded files, recover deleted content, or identify data remnants in disk images and memory dumps. Search for file signatures (magic bytes) that indicate recoverable data fragments.

Security Audits & Vulnerability Research

Check binary files for hardcoded credentials, API keys, IP addresses, or cryptographic material. Search for strings embedded in firmware, configuration binaries, or mobile app packages.

Firmware & IoT Analysis

Analyze firmware binaries by searching for version strings, hardware identifiers, partition tables, and bootloader signatures. Find embedded file systems and locate configuration data.

Digital Forensics & File Carving

During forensic investigations, search raw disk images or memory dumps for file signatures to recover deleted files. Locate JPEG, PDF, or ZIP headers with wildcards for partial matches.

About

What Is Binary Pattern Searching?

Binary pattern searching is the process of finding specific byte sequences within a binary file. Unlike text search, binary search operates on raw bytes - each byte can be any value from 00 to FF. Patterns can include exact bytes (FF D8 FF), wildcards (?? ?? 00), or string sequences converted to their byte representations.

Hex Patterns vs String Patterns vs Regex

Hex patterns search for exact byte values - ideal for file signatures (magic bytes) and binary protocol markers. String patterns convert text to bytes for finding ASCII strings within binary files. Regex patterns operate on the hexadecimal string representation, allowing pattern matching across hex values - useful for finding variable patterns like version numbers or ranges.

Wildcards in Hex Patterns

Wildcard bytes (??, **, .., or XX) match any byte value at that position. This is useful when searching for patterns where some bytes are variable: for example, 50 4B 03 04 matches any ZIP local file header, and 50 4B ?? 04 matches more broadly. Wildcards dramatically increase search flexibility when dealing with version-specific or configuration-dependent byte values.

Browser-Based & Private

All searching happens locally in your browser - files are never uploaded. The tool reads file content using the File API and processes everything with plain JavaScript. This makes it suitable for analyzing sensitive files including security research samples, proprietary data, and personal documents.

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FAQ
What is a binary pattern finder?
A binary pattern finder lets you search for specific byte sequences within any file by looking at the raw binary data. You can search using hex bytes (with wildcards), text strings, or regular expressions. It shows every occurrence with surrounding context, byte offset, and hex/ASCII representations.
How do I use hex patterns with wildcards?
Enter hex bytes separated by spaces. Use ?? or XX at any position to match any byte value. For example, "FF D8 FF" finds JPEG file headers, while "50 4B ?? 04" finds ZIP entries where the third byte can be anything (different version numbers).
How does string search work?
String search converts your text to byte values using ASCII encoding and searches the file for that exact byte sequence. Toggle case sensitivity on/off. For example, searching for "JFIF" finds JPEG File Interchange Format markers, and "IHDR" finds PNG image header chunks.
Can I use regular expressions?
Yes. In regex mode, your pattern is matched against the hex representation of the file (each byte converted to a 2-character hex string). Matches only occur at byte boundaries (even positions in the hex string). This allows powerful pattern matching like "(FF D8){2,4}" to find 2-4 consecutive JPEG markers.
How large of a file can I search?
Files up to 256 MB can be searched. The tool reads the entire file into memory for fast searching. For very large files, the first 256 MB is searched. Up to 500 matches are shown to keep the UI responsive - a truncation indicator is shown when results are limited.
What does the context display show?
Each match shows configurable surrounding context bytes (default 8 bytes before and after) in both hex and ASCII. This helps you understand what data surrounds the matched pattern. The byte offset is shown in both hex (0x format) and decimal for easy reference.
Is my file uploaded to a server?
No. All binary pattern searching happens entirely in your browser using the File API. Your files never leave your device - no server upload, no data logging, no third-party requests. This tool is safe for analyzing sensitive, proprietary, or confidential files.
What's the difference between hex, string, and regex modes?
Hex mode searches for exact byte values with optional wildcards - best for file signatures and protocol markers. String mode converts text to ASCII bytes - best for finding embedded text. Regex mode applies a regular expression to the hex string - best for complex patterns with variable-length matches or optional bytes.
Is this Binary Pattern Finder free to use?
Yes - 100% free, forever. No signup, no account, no premium tier, no usage limits, and no ads. Search as many files as you need. All processing is local in your browser with zero server uploads.